CDU-541
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
5
.2.21.
READ
SUB-CHANNEL
Command
==============~=======================================
========================
Bit
I
Byte I
7
6
5
4
3
2
1
a
==============================================================================
o :
Operation
Code (C2h) :
-----i-----------------------------------------------------------------------:
, :
Logical
Unit
Number:
Reserved
i
-----:-----------------------------------------------------------------------i
2
iReservedi
Sub Q :
Reserved
I
-----i-----------------------------------------------------------------------
3
1
Reserved
-----i-----------------------------------------------------------------------
4 :
Reserved
-----1-----------------------------------------------------------------------
5 1
Reserved
-----1-----------------------------------------------------------------------
6 I
Reserved
I
-----1-----------------------------------------------------------------------1
7 1
(MSB)
I
-----1---
Allocation
Length
---I
8 i
(LSB)
I
-----1-----------------------------------------------------------------------1
9 :
Control
Byte
:
==============================================================================
The
READ
SUB-CHANNEL
command
requests
that
the
target
return
the
requested
sub-channel
data
of
the
current
block.
The
data
format
returned
is
specified
by
the
LBAMSF
bit
of
MODE
SELECT
page code 8. The
LBAMSF
bit
of
zero
indicates
that
the
target
will
return
LBA
data
format.
The
LBAMSF
bit
of
one
indicates
that
the
target
will
return
MSF
data
format.
The Sub Q
bit
set
to
one
requests
the
target
return
the
Q
sub-channel
data.
The Sub Q
bit
set
to
zero
requests
that
no
data
be
returned.
NOTE:
The
other
bits
in
this
byte
are
reserved
for
use
in
requesting
other
sub-channel
data.
The
bits
occur
in
the
sub-channel
in
P Q R
STU
V W
order.
At
present
returning
data
from
the
other
sub-channels
is
not
permitted
by
the
medium
standards.
5-38
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